Viking Lander 2 is far enough north that frost deposits may form on the surface during winter. This image, taken in May 1979, shows a thin, white layer of water frost, estimated to be only micrometers (1 micrometer = 0.001 millimeters) thick, covering parts of the surface. The reddish regions are soil and rock not covered by the frost. Portions of the spacecraft are visible in the right foreground.
Viking Lander image 21I093